All mayors are not the same. All columnists, however...

Rebuttal is futile, but sometimes it is necessary, and at least you can help people update their lists of people to ignore. Here's Zoe Williams wilfully misleading the readers.

From two completely different sources – Ted Reilly, a road safety campaigner, and Alice Bell, a lecturer in science and society and part-time Sack Boris campaigner – I heard astonishing things about air quality in London. They say it correlates, not vaguely but absolutely precisely, with the traffic volume, that it is the largest threat to public health after smoking (seriously!), and that once you get any distance from its source – 20 yards – it vanishes.

In other words, if you pedestrianised major thoroughfares from 8am til 8pm, if you dropped speed limits, if you made public transport cheaper, if you consolidated deliveries to the periphery and got one provider to bring it all to the centre ("We used to call it the Royal Mail," Reilly remarks, erm, wryly) you could do as much for the health of London as the person who discovered that smoking caused cancer.

Economically, it comes up repeatedly in living wage analyses that the cost of transport is not just a pest, it changes people's lives. The tube has become a luxury, a young professional's option. For someone with two separate cleaning jobs, most likely the only way to make that work economically would be by bus. Say that adds an hour (it's probably more) to the commute, that will ricochet into that person's stress levels, their parenting, their mental health, everything.

The mayor, whoever it is, can do a lot more with the powers he (or she, ha!) has than Boris Johnson is doing, or Ken Livingstone is suggesting. But it is also worth considering that, paradoxically, if they had more power, we would probably hate them a lot less.

Strangely, one mayoral candidate has in the past dramatically cut public transport fares, imposed a tax on motor vehicles in central London, and set up a low emissions zone to restrict how much poison lorries can emit in the city. That would be Ken Livingstone. I put it to you that someone who is unaware of congestion charging or Fares Fair shouldn't be writing about London politics.

Another mayoral candidate gave up on the low emissions zone, abolished the western extension of the congestion charge, and put up the fares. That would be Boris Johnson. I put it to you that someone who is unaware of this hasn't been paying attention and shouldn't be writing about London politics.

On page three of Ken Livingstone's manifesto, he explicitly promises to cut public transport fares by 7% immediately and reduce pollution. The next eight pages consist of nothing but public transport. Page 8 contains the following quote:

Faster, greener, more efficient freight
I will ask TfL to look seriously at the possibility of more freight consolidation centres for London. This would mean deliveries are taken to hubs and aggregated together before being taken into central London, saving on costs and cutting traffic.

The next page is about cycling, and the one after that about the necessity of investing in public transport in order to reduce pollution.

Page 66 is devoted to air pollution, including the creation of clean air zones with much lower speed limits and a ban on idling cars around schools, and the issue of smog alerts by SMS (something Boris Johnson directly refused to do). I could go on.

The sad facts are that a lot of journalists, Zoe Williams included, are evidently just fine with the largest threat to public health after smoking so long as their petty personal elite vendettas, the ego wars of media London, get took care of.